Apple today released the iOS 5.1.1 Software Update for the iPhone, iPad and iPod touch. According to the company, this update includes the following improvements and bug fixes:

- Improves reliability of using HDR option for photos taken using the Lock Screen shortcut.
- Addresses bugs that could prevent the new iPad from switching between 2G and 3G networks.
- Fixes bugs that affected AirPlay video playback in some circumstances.
- Improved reliability for syncing Safari bookmarks and Reading List.
- Fixes an issue where 'Unable to purchase' alert could be displayed after successful purchase.

The iOS 5.1.1 Software Update is available via iTunes or over-the-air as a direct download.